Emission from electronically excited species forms the basis for an important class of light sources-lasers. So far, commercially available solution-processed blue-emitting laser materials are based on organic compounds or semiconductor nanocrystals that have significant limitations: either low solubility, chemical- and/or photo-stability uncompetitive prices. Here we report a novel and competitive alternative to these existing is boron hydrides, inorganic cluster with rich diverse...

Abstract Metal–organic frameworks (MOFs) are a chemically and topologically diverse family of materials composed inorganic nodes organic linkers bound together by coordination bonds. Presented here two significant innovations in this field. The first is the use new group, phenylene‐1,4‐bis(methylphosphinic acid) (PBPA), phosphinic acid analogue commonly used terephtalic acid. Use linker group leads to formation hydrothermally stable permanently porous MOF structure. second innovation...

B 18 H 20 (NC 5 ) 2 is a rare example of two conjoined boron hydride subclusters nido and arachno geometrical character. At room temperature, solutions emit 690 nm fluorescence. In the solid state, this emission shifted to 620 intensifies due restriction rotation pyridine ligands. addition, there thermochromicity fluorescence . Cooling 8 K engenders further shift in wavelength 585 twofold increase intensity. Immobilization polystyrene thin‐film matrix results an efficient absorption pumping...

The photophysics of the two isomers octadecaborane(22), anti- and syn-B18H22, have been studied by UV–vis spectroscopic techniques theoretical computational methods. In air-saturated hexane, anti-B18H22 shows fluorescence with a high quantum yield, ΦF = 0.97, singlet oxygen O2(1Δg) production (ΦΔ ∼ 0.008). Conversely, isomer syn-B18H22 no measurable fluorescence, instead displaying much faster, picosecond nonradiative decay excited states. Computed potential energy hypersurfaces (PEHs) for...

The preparation and characterization of micrometer gold silver single-crystals well-defined shapes are reported here. the crystals can be described as plates, polyhedra, wires. orientation crystal faces was studied using electron X-ray powder diffraction techniques, a (111) large plates experimentally shown. surface morphology by atomic force microscopy. Modifications microplates with thiolated carborane clusters 1,2-(HS)2-1,2-C2B10H10 (1), 9,12-(HS)2-1,2-C2B10H10 (2),...

The tuning of the photophysical properties highly fluorescent boron hydride cluster anti-B18H22 (1), by straightforward chemical substitution to produce 4,4′-(HS)2-anti-B18H20 (2), facilitates intersystem crossing from excited singlet states a triplet manifold. This subsequently enhances O2(1Δg) oxygen production quantum yield ΦΔ ∼ 0.008 in 1 0.59 2. paper describes synthesis and full structural characterization new compound (2) uses UV–vis spectroscopy coupled with density functional theory...

One-step derivatization of the laser borane, <italic>anti</italic>-B₁₈H₂₂, with pyridine gives three uniquely structured macropolyhedral boranes interesting photophysical properties.

Abstract For the structural extent of polyhedral molecular chemistry boron to rival that organic carbon hydrides, (a) individual boron-containing polyhedra need be fused together make larger contiguous covalent assemblies, and (b) an intermolecular needs developed. Contemporary examples are given illustrate novel in both these areas may point way some future developments.

In contrast to films fabricated by physical vapor deposition methods, thin of Na0.5K0.5NbO3 (NKN) made metal alkoxide sol−gel routes generally fail exhibit polarization-electric field responses typical a ferroelectric. This study sets out investigate the reasons for problems in producing NKN examining thermochemistry gel ceramic conversion. The precursor gels displayed multiple heating DTA crystallization exotherms temperature range 480−550 °C, which are attributed compositional segregation...

Luminescence is observed in three novel macropolyhedral nineteen- and eighteen-vertex chalcogenaboranes: Se

Three nido-decaborane thiol cluster compounds, [1-(HS)-nido-B(10)H(13)] 1, [2-(HS)-nido-B(10)H(13)] 2, and [1,2-(HS)(2)-nido-B(10)H(12)] 3 have been characterized using NMR spectroscopy, single-crystal X-ray diffraction analysis, quantum-chemical calculations. In the solid state, feature weak intermolecular hydrogen bonding between sulfur atom relatively positive bridging atoms on open face of an adjacent cluster. Density functional theory (DFT) calculations show that value interaction...

Treatment of the laser borane anti-B18H22 (compound 1) with iodine in ethanol gives monoiodinated derivative 7-I-anti-B18H21 2) 67% yield, or, by reaction or ICl presence AlCl3 dichloromethane, diiodinated 4,4′-I2-anti-B18H20 3) 85% yield. On excitation 360 nm light, both compounds 2 and 3 give strong green phosphorescent emissions (λmax = 525 nm, ΦL 0.41 λmax 545 0.71 respectively) that are quenched dioxygen to produce O2(1Δg) singlet oxygen quantum yields ΦΔ 0.52 0.36 respectively....

Abstract Metal–organic frameworks (MOFs) are a chemically and topologically diverse family of materials composed inorganic nodes organic linkers bound together by coordination bonds. Presented here two significant innovations in this field. The first is the use new group, phenylene‐1,4‐bis(methylphosphinic acid) (PBPA), phosphinic acid analogue commonly used terephtalic acid. Use linker group leads to formation hydrothermally stable permanently porous MOF structure. second innovation...

Using the first laser borane, <italic>anti</italic>-B₁₈H₂₂, as a case study, our combined experimental and theoretical approach unravels photophyscial photochemical molecular dynamics of highly efficient luminophore in an excited electronic state.

Metallaborane compounds containing two adjacent metal atoms, [(PMe2Ph)4MM′B10H10] (where MM′ = Pt2, 1; PtPd, 7; Pd2, 8), have been synthesized, and their propensity to sequester O2, CO, SO2 then release them under pulsed continuous irradiation are described. Only [(PMe2Ph)4Pt2B10H10], 1, undergoes reversible binding of O2 form [(PMe2Ph)4(O2)Pt2B10H10] 3, but solutions 7, 8 all quantitatively take up CO across metal–metal vectors [(PMe2Ph)4(CO)Pt2B10H10] 4, [(PMe2Ph)4(CO)PtPdB10H10] 10,...

Methylation of anti-B18H22 (1) affords the first example alkyl substitution terminal hydrogen atoms on fluorescent octadecaborane-22 molecule to give highly methylated 2,2'-Cl2-1,1',3,3',4,4',7,7',8,8',10,10'-Me12-anti-B18H8 (2). This extensive chemical leads a swelling in polyhedral volume 18-vertex boron atomic skeleton and an enhancement absorption solubility characteristics this molecule. We propose "swollen volume" be result marked increase relative positivity "cluster-only total...

We present the first examples of alkylated derivatives macropolyhedral boron hydride, anti-B18H22, which is gain medium in borane laser. This new series ten highly stable and colorless organic-inorganic hybrid clusters are capable conversion UVA irradiation to blue light with fluorescence quantum yields unity. study gives a comprehensive description their synthesis, isolation, structural characterization together delineation photophysical properties using combined theoretical experimental...

The macropolyhedral [B19H22]− monoanion 1 and the dianion [B19H21]2− 2 are synthesized in consistent 86−92% yields by reaction of [PSH]+[syn-B18H21]− with BH3(SMe2) 1,2-Cl2C2H4 at 72 °C. ['PS' is an abbreviation for 'Proton Sponge', 1,8-bis-(dimethylamino)naphthalene. 'PSH' its protonated derivative.] molecular structures were elucidated as their [PS{BH2}]+ [PS{BH2}]2+ salts 1a 2a single-crystal X-ray diffraction studies, which all atoms located, supported mass spectrometric analyses...

The cobalt bis(dicarbollide) anion [(1,2-C2B9H11)2-3,3′-Co]− (1–) is an increasingly important building block for the design of new biologically active compounds. Here we report reactions lithiated 1– with N-(ω-bromoalkyl)phthalimides Br-(CH2)n-N(CO)2NC6H4 (where n = 1 to 3) that give a number compounds substituted at dicarbollide carbon atom positions. For 2 and 3, substitution accompanied by cyclocondensation organic moieties polycyclic ring structures attached cage. Predominant products...

The reaction of K[arachno-B9H14] with [NiCl2(dppe)] produces four new 19-vertex macropolyhedral metallaboranes that result from borane cluster fusion: [9′-(dppe)-9′-Ni-anti-B18H20] (1) and isomeric [11′-(dppe)-11′-Ni-syn-B18H20] (2), together the chlorine-substituted derivative 1, [5′-Cl-9′-(dppe)-9′-Ni-anti-B18H19] (3), 18-vertex compound [7′-(dppe)-7′-anti-NiB17H21] (4). Two closo 10-vertex single-cluster species, [1-(dppe)-1-closo-NiB9H7Cl2] (5) [1-(dppe)-1-closo-NiB9H7Cl(OH)] (6), were...

Abstract Luminescence is observed in three novel macropolyhedral nineteen‐ and eighteen‐vertex chalcogenaboranes: Se 2 B 17 H ( 1 ), SeB 19 3 ) 18 20 4 ). This led us to the recognition that previously published heteroborane species might also exhibit luminescence. Thus, known dithiaboranes S n ‐S 16 5 i 6 were synthesised found a range of luminescent properties. These are very different from unique fluorescent binary borane 22 terms their structural architectures, by presence cluster hetero...

Single-crystal conventional-tube and synchrotron X-ray diffraction studies of the anions in [NMe4][arachno-B9H12-4,8-Br2] 1 K[arachno-B9H14] 2, also series adducts [arachno-B9H13-4-L], where L is P(CCH)3 (3), NHEt2 (4), NC5H5 (5), or NH2CH2Ph (6), are reported. Structural 1−6, determined at low temperatures, located all atoms, including bridging endo-terminal hydrogen atoms. The basic boron-hydride clusters these, other known species with arachno nine-vertex i-nonanborane geometry reported...